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<div>[[Category:83:Ports:By_Address|04 - Timer Interrupt Frequency]] [[Category:83Plus:Ports:By_Name|Timer Interrupt Frequency]]<br />
== Synopsis ==<br />
'''Port Number:''' 04h<br />
<br />
'''Function:''' Timer Interrupt Frequency<br />
<br />
This port controls the frequency of the hardware timer.<br />
<br />
=== Read Values ===<br />
This is a mirror of the link port.<br />
<br />
=== Write Values ===<br />
* Bit 0: Unknown. The calculator crashes when set. Maybe it has more or less the same behaviour as bit 0 of [[83Plus:Ports:04]].<br />
* Bits 1 and 2 control the hardware timer frequency. Setting both 0 sets the timer to the fastest speed, and both 1 is the slowest speed. The normal speed is with both bits 1.<br />
* Bit 3: Unused? Always 0.<br />
* Bit 4: Unused? Always 1.<br />
* Bit 5-7: Unknown, but definitely used.</div>195.56.243.181